@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600&family=Playfair+Display:ital,wght@0,400;0,600;1,400&display=swap');

/* Additional Fonts for the reader */
@import url('https://fonts.googleapis.com/css2?family=Courier+Prime&display=swap');

:root {
  --bg-color: #F7F3E8; 
  --text-color: #2C2C2C;
  --accent-color: #8B5A2B;
  --card-bg: #FFFFFF;
  --font-serif: 'Playfair Display', serif;
  --font-sans: 'Inter', sans-serif;
  --nav-bg: rgba(247, 243, 232, 0.95);
}

/* Themes */
body.theme-light { --bg-color: #FFFFFF; --text-color: #000000; --nav-bg: rgba(255, 255, 255, 0.95); --card-bg:#F5F5F5;}
body.theme-sepia { --bg-color: #F7F3E8; --text-color: #2C2C2C; --nav-bg: rgba(247, 243, 232, 0.95); }
body.theme-dark { --bg-color: #1A1A1A; --text-color: #E0DCD3; --nav-bg: rgba(26, 26, 26, 0.95); --card-bg: #2C2C2C;}
body.theme-ocean { --bg-color: #1B263B; --text-color: #E0E1DD; --nav-bg: rgba(27, 38, 59, 0.95); --card-bg: #415A77; --accent-color: #778DA9;}
body.theme-parchment { --bg-color: #E8D8B0; --text-color: #4A3B2C; --nav-bg: rgba(232, 216, 176, 0.95); --card-bg: #D4C49A; --accent-color: #8C6A4A;}
body.theme-cafe { --bg-color: #2B2118; --text-color: #D6C5B3; --nav-bg: rgba(43, 33, 24, 0.95); --card-bg: #4A392B; --accent-color: #A68A6D;}

* { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
  -webkit-tap-highlight-color: transparent; 
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden; /* Avoid horizontal scroll during transitions */
}

/* General Layouts */
h1, h2, h3 { font-family: var(--font-serif); font-weight: 600; margin-bottom: 1rem; }
h1 { font-size: 2.5rem; text-align: left; letter-spacing: -0.02em; }
p { margin-bottom: 1rem; font-size: 1.1rem; }

.container { max-width: 800px; margin: 0 auto; padding: 2rem; flex: 1; display: flex; flex-direction: column; }
.auth-wrapper { background-color: var(--card-bg); padding: 3rem; border-radius: 16px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05); max-width: 500px; width: 100%; margin: 0 auto; }
.auth-header { text-align: center; margin-bottom: 2rem; }
.auth-header h1 { font-size: 2rem; margin-bottom: 0.5rem; }
.auth-header p { color: var(--accent-color); font-style: italic; font-family: var(--font-serif); }

.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.5rem; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; opacity: 0.8; }
.form-group input, .form-group select { width: 100%; padding: 1rem; border: 1px solid rgba(0, 0, 0, 0.1); border-radius: 8px; font-family: var(--font-sans); font-size: 1rem; background-color: var(--bg-color); color: var(--text-color); }
button[type="submit"] { width: 100%; padding: 1rem; background-color: var(--accent-color); color: #FFF; border: none; border-radius: 8px; font-family: var(--font-sans); font-weight: 600; font-size: 1rem; cursor: pointer; transition: background-color 0.3s ease; }
button[type="submit"]:hover { filter: brightness(0.9); }

/* Library Page */
.library-header { text-align: center; margin-bottom: 3rem; padding-top: 2rem; }
.books-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 2rem; }
.book-card { background-color: var(--card-bg); border-radius: 12px; padding: 2rem; text-align: center; text-decoration: none; color: var(--text-color); box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03); transition: transform 0.3s ease; display: flex; flex-direction: column; align-items: center; }
.book-card:hover { transform: translateY(-5px); box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08); }
.book-icon { width: 80px; height: 110px; background-color: var(--accent-color); border-radius: 4px 8px 8px 4px; margin-bottom: 1.5rem; position: relative; box-shadow: -3px 0 5px rgba(0,0,0,0.2) inset; }
.book-icon::before { content: ''; position: absolute; left: 5px; top: 0; bottom: 0; width: 2px; background-color: rgba(255,255,255,0.2); }
.book-title { font-family: var(--font-serif); font-size: 1.3rem; font-weight: 600; margin-bottom: 0.5rem; }
.book-meta { font-size: 0.9rem; opacity: 0.7; }

/* Reader Layout */
#viewer-wrapper { position: fixed; top: 0; left: 0; right: 0; bottom: 0; overflow: hidden; background-color: transparent; }
#viewer { width: 100%; height: 100%; }

/* Page Animations */
body.transition-fade #viewer-wrapper.animating-fade { animation: fadePage 0.3s ease-in-out; }
@keyframes fadePage { 0% { opacity: 1; } 50% { opacity: 0; } 100% { opacity: 1; } }

body.transition-slide #viewer-wrapper.animating-slide { animation: slidePage 0.3s ease-in-out; }
@keyframes slidePage { 0% { transform: translateX(0); } 50% { transform: translateX(-10%); opacity:0; } 51% { transform: translateX(10%); } 100% { transform: translateX(0); opacity:1; } }

/* Tap Zones */
.tap-zone { position: absolute; top: 0; bottom: 0; z-index: 100; -webkit-tap-highlight-color: transparent; }
.tap-zone.left { left: 0; width: 25%; cursor: pointer; }
.tap-zone.middle { left: 25%; width: 50%; cursor: pointer; }
.tap-zone.right { right: 0; width: 25%; cursor: pointer; }

/* Brightness Overlay */
#brightness-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; pointer-events: none; z-index: 10; transition: background-color 0.3s; }

/* Loader */
.loader { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); font-family: var(--font-serif); font-size: 1.2rem; color: var(--accent-color); z-index: 100; animation: pulse 1.5s infinite ease-in-out; }
@keyframes pulse { 0% { opacity: 0.5; } 50% { opacity: 1; } 100% { opacity: 0.5; } }

/* Top Nav Overlay */
.reader-nav { position: fixed; top: 0; left: 0; right: 0; padding: 1rem 1.5rem; background-color: var(--nav-bg); backdrop-filter: blur(10px); display: flex; justify-content: space-between; align-items: center; z-index: 200; box-shadow: 0 2px 10px rgba(0,0,0,0.05); transform: translateY(-100%); transition: transform 0.3s ease; }
.reader-nav.visible { transform: translateY(0); }
.back-link { text-decoration: none; color: var(--accent-color); font-weight: 600; display: flex; align-items: center; gap: 0.5rem; }

/* FAB Button */
.fab { position: fixed; bottom: 2rem; right: 2rem; width: 60px; height: 60px; border-radius: 30px; background-color: var(--accent-color); color: #fff; border: none; box-shadow: 0 4px 15px rgba(0,0,0,0.2); cursor: pointer; z-index: 150; display: flex; align-items: center; justify-content: center; transition: transform 0.2s; }
.fab:active { transform: scale(0.9); }

/* Expert Panel (Bottom Right Modal) */
.expert-panel { position: fixed; bottom: 5rem; right: 2rem; width: 350px; max-height: 70vh; background-color: var(--card-bg); border-radius: 12px; z-index: 40; box-shadow: 0 10px 40px rgba(0,0,0,0.2); display: flex; flex-direction: column; overflow: hidden; transform: translateY(20px); opacity: 0; pointer-events: none; transition: all 0.3s ease; }
.expert-panel:not(.hidden) { transform: translateY(0); opacity: 1; pointer-events: auto; }

.panel-header { display: flex; justify-content: space-between; align-items: center; background-color: rgba(0,0,0,0.05); border-bottom: 1px solid rgba(0,0,0,0.1); }
.tabs { display: flex; flex: 1; }
.tab-btn { flex: 1; padding: 1rem 0; background: none; border: none; border-bottom: 2px solid transparent; cursor: pointer; font-size: 1.2rem; color: var(--text-color); opacity: 0.6; transition: all 0.2s; }
.tab-btn.active { opacity: 1; border-bottom-color: var(--accent-color); }
.close-btn { background: none; border: none; padding: 1rem; color: var(--text-color); cursor: pointer; font-size: 1.2rem; }

.panel-content { padding: 1.5rem; overflow-y: auto; flex: 1; }
.tab-pane { display: none; }
.tab-pane.active { display: block; }

.tab-pane h3 { font-size: 1.1rem; border-bottom: 1px solid rgba(0,0,0,0.1); padding-bottom: 0.5rem; margin-bottom: 1rem; }

/* Lists (TOC, Search, Bookmarks) */
.list-view { list-style: none; margin: 0; padding: 0; }
.list-view li { padding: 0.8rem; border-bottom: 1px solid rgba(0,0,0,0.05); cursor: pointer; font-size: 0.9rem; transition: background 0.2s; border-radius:4px; }
.list-view li:hover { background-color: rgba(0,0,0,0.05); }

/* Settings Grid */
.theme-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0.5rem; }
.theme-btn { padding: 0.8rem 0; border: 1px solid rgba(0,0,0,0.1); border-radius: 8px; font-weight: 600; cursor: pointer; transition: transform 0.2s; font-size: 0.9rem;}
.theme-btn:active { transform: scale(0.95); }

#font-select, #transition-select { width: 100%; padding: 0.8rem; border-radius: 8px; border: 1px solid rgba(0,0,0,0.1); background: var(--bg-color); color: var(--text-color); font-family: var(--font-sans); outline: none; }

.size-controls { display: flex; gap: 0.5rem; }
.size-controls button { flex: 1; padding: 0.8rem; background: var(--bg-color); color: var(--text-color); border: 1px solid rgba(0,0,0,0.1); border-radius: 8px; font-weight: 600; cursor: pointer; font-size: 1.1rem; }
.size-controls button:active { transform: scale(0.95); background: var(--accent-color); color: white;}

/* Bottom Navigation */
/* Bottom Navigation - Responsive & Premium */
.bottom-nav {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  max-width: 450px;
  height: 65px;
  background-color: rgba(255, 254, 245, 0.4);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 9999;
  box-shadow: 0 10px 40px rgba(0,0,0,0.12);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 25px;
  transition: all 0.3s ease;
}

/* On PC/Large Screens */
@media (min-width: 1024px) {
  .bottom-nav {
    bottom: 30px;
    height: 70px;
    max-width: 500px;
  }
  .nav-item span { font-size: 0.8rem; }
}

.nav-item {
  text-decoration: none;
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  opacity: 0.4;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  flex: 1;
  height: 100%;
  touch-action: manipulation; /* Reduce click delay */
  user-select: none;
  position: relative; /* For the bubble */
  -webkit-tap-highlight-color: transparent; /* Remove gray rectangle */
  outline: none;
}

.nav-item:active, .nav-item.active-touch {
  transform: scale(0.9);
  opacity: 0.8;
}

.nav-item svg { width: 22px; height: 22px; stroke-width: 2.2; transition: transform 0.2s; }
.nav-item:active svg, .nav-item.active-touch svg { transform: translateY(-2px); }
.nav-item span { font-size: 0.7rem; font-weight: 700; }
.nav-item.active { 
  opacity: 1; 
  color: var(--accent-color); 
  transform: translateY(-3px); 
}

/* The iOS 26 Sliding Bubble */
.nav-item.active::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 85%;
  height: 80%;
  background: rgba(139, 90, 43, 0.1);
  border-radius: 15px;
  z-index: -1;
  view-transition-name: nav-active-bubble;
}

.nav-item.active svg { filter: drop-shadow(0 2px 5px rgba(139, 90, 43, 0.3)); }

/* Space for body */
body { padding-bottom: 100px; }
@media (min-width: 1024px) { body { padding-bottom: 120px; } }
#viewer-wrapper { padding-bottom: 0; } /* No padding in reader */

/* View Transitions API - Mobile App Feel */
@view-transition {
  navigation: auto; /* Enable for multi-page apps */
}

::view-transition-old(root) {
  animation: 0.15s cubic-bezier(0, 0, 0.2, 1) both fade-out,
             0.15s cubic-bezier(0, 0, 0.2, 1) both slide-to-left;
}

::view-transition-new(root) {
  animation: 0.15s cubic-bezier(0, 0, 0.2, 1) both fade-in,
             0.15s cubic-bezier(0, 0, 0.2, 1) both slide-from-right;
}

@keyframes fade-in {
  from { opacity: 0; }
}

@keyframes fade-out {
  to { opacity: 0; }
}

@keyframes slide-from-right {
  from { transform: translateX(30px); }
}

@keyframes slide-to-left {
  to { transform: translateX(-30px); }
}

/* Make bottom nav persistent during transitions */
.bottom-nav {
  view-transition-name: bottom-navigation;
}

/* Book Opening Transition */
.detail-icon {
  view-transition-name: active-book;
}

/* Home Dashboard Styles */
.welcome-header { margin-bottom: 2rem; padding: 1rem 0; }
.welcome-header h1 { text-align: left; font-size: 2rem; margin-bottom: 0.2rem; }
.welcome-header p { opacity: 0.7; }

.section-title { font-size: 1.2rem; margin: 2rem 0 1rem; display: flex; justify-content: space-between; align-items: center; }
.section-title a { font-size: 0.9rem; color: var(--accent-color); text-decoration: none; font-weight: 600; }

.resume-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 1.5rem;
  display: flex;
  gap: 1.5rem;
  align-items: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
  text-decoration: none;
  color: inherit;
  margin-bottom: 1rem;
}

.resume-info h4 { font-family: var(--font-serif); font-size: 1.2rem; margin-bottom: 0.3rem; }
.resume-info p { font-size: 0.9rem; opacity: 0.6; margin: 0; }

/* Book Detail Styles */
.book-detail-hero { display: flex; flex-direction: column; align-items: center; text-align: center; margin-bottom: 2rem; }
.detail-icon { width: 140px; height: 200px; margin-bottom: 1.5rem; }
.rating-tag { background: rgba(139, 90, 43, 0.1); color: var(--accent-color); padding: 4px 12px; border-radius: 20px; font-weight: 600; font-size: 0.9rem; margin-bottom: 1rem; display: inline-block; }
.synopsis { line-height: 1.8; opacity: 0.8; margin-bottom: 2rem; }

.action-buttons { display: flex; flex-direction: column; gap: 1rem; }
.btn-primary { background: var(--accent-color); color: white; border: none; padding: 1.2rem; border-radius: 12px; font-weight: 600; font-size: 1rem; cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 0.5rem; }
.btn-secondary { background: rgba(0,0,0,0.05); color: var(--text-color); border: none; padding: 1rem; border-radius: 12px; font-weight: 600; font-size: 0.9rem; cursor: pointer; }